                    &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         &\multicolumn{1}{c}{(5)}         &\multicolumn{1}{c}{(6)}         &\multicolumn{1}{c}{(7)}         &\multicolumn{1}{c}{(8)}         \\
\hline
ln(other cost) - ln(hp cost)&       0.159\sym{***}&                     &                     &                     &                     &                     &                     &       0.101\sym{***}\\
                    &     (0.017)         &                     &                     &                     &                     &                     &                     &     (0.031)         \\
[1em]
\$30-59k             &                     &      -0.018         &                     &                     &                     &                     &                     &      -0.011         \\
                    &                     &     (0.012)         &                     &                     &                     &                     &                     &     (0.012)         \\
[1em]
\$60-99k             &                     &      -0.037\sym{**} &                     &                     &                     &                     &                     &      -0.015         \\
                    &                     &     (0.013)         &                     &                     &                     &                     &                     &     (0.012)         \\
[1em]
\$100k+              &                     &      -0.064\sym{***}&                     &                     &                     &                     &                     &      -0.028\sym{*}  \\
                    &                     &     (0.012)         &                     &                     &                     &                     &                     &     (0.013)         \\
[1em]
Black               &                     &                     &       0.029\sym{*}  &                     &                     &                     &                     &      -0.007         \\
                    &                     &                     &     (0.014)         &                     &                     &                     &                     &     (0.014)         \\
[1em]
Nat.Am.             &                     &                     &       0.016         &                     &                     &                     &                     &       0.004         \\
                    &                     &                     &     (0.058)         &                     &                     &                     &                     &     (0.055)         \\
[1em]
Asian               &                     &                     &       0.009         &                     &                     &                     &                     &       0.009         \\
                    &                     &                     &     (0.018)         &                     &                     &                     &                     &     (0.017)         \\
[1em]
Other               &                     &                     &       0.051\sym{*}  &                     &                     &                     &                     &       0.008         \\
                    &                     &                     &     (0.023)         &                     &                     &                     &                     &     (0.022)         \\
[1em]
Owner               &                     &                     &                     &      -0.060\sym{***}&                     &                     &                     &      -0.056\sym{***}\\
                    &                     &                     &                     &     (0.009)         &                     &                     &                     &     (0.009)         \\
[1em]
Rural               &                     &                     &                     &                     &       0.015         &                     &                     &       0.034\sym{**} \\
                    &                     &                     &                     &                     &     (0.013)         &                     &                     &     (0.012)         \\
[1em]
Northeast           &                     &                     &                     &                     &                     &       0.010         &                     &       0.009         \\
                    &                     &                     &                     &                     &                     &     (0.008)         &                     &     (0.008)         \\
[1em]
South               &                     &                     &                     &                     &                     &       0.096\sym{***}&                     &       0.050\sym{**} \\
                    &                     &                     &                     &                     &                     &     (0.011)         &                     &     (0.019)         \\
[1em]
West                &                     &                     &                     &                     &                     &       0.010         &                     &      -0.016         \\
                    &                     &                     &                     &                     &                     &     (0.009)         &                     &     (0.012)         \\
[1em]
1950s               &                     &                     &                     &                     &                     &                     &       0.021         &       0.015         \\
                    &                     &                     &                     &                     &                     &                     &     (0.012)         &     (0.012)         \\
[1em]
1960s               &                     &                     &                     &                     &                     &                     &       0.032\sym{*}  &       0.018         \\
                    &                     &                     &                     &                     &                     &                     &     (0.013)         &     (0.012)         \\
[1em]
1970s               &                     &                     &                     &                     &                     &                     &       0.039\sym{**} &       0.018         \\
                    &                     &                     &                     &                     &                     &                     &     (0.013)         &     (0.012)         \\
[1em]
1980s               &                     &                     &                     &                     &                     &                     &       0.048\sym{**} &       0.025         \\
                    &                     &                     &                     &                     &                     &                     &     (0.015)         &     (0.014)         \\
[1em]
1990s               &                     &                     &                     &                     &                     &                     &       0.033\sym{*}  &       0.024         \\
                    &                     &                     &                     &                     &                     &                     &     (0.015)         &     (0.014)         \\
[1em]
2000s               &                     &                     &                     &                     &                     &                     &       0.023         &       0.021         \\
                    &                     &                     &                     &                     &                     &                     &     (0.015)         &     (0.015)         \\
\hline
Observations        &       27307         &       27307         &       27307         &       27307         &       27307         &       27307         &       27307         &       27307         \\
